Catalyst dosing method for start-up of olefin conversion unit

Abstract

The invention relates to an alkene conversion apparatus start-working catalyst adding method. An alkene conversion apparatus comprises: (A) an alkene conversion reactor (3); and (B) a catalyst reactivator (4), wherein the alkene conversion reactor (3) is connected with the catalyst reactivator (4) via a regeneration catalyst conveying pipe and a to-be regenerated catalyst conveying pipe. The method comprises: (a) adding a catalyst into the catalyst reactivator (4), heating and storing heat; (b) when the catalyst reactivator (4) is heated for heat storing, adding a catalyst and heating; (c) after the heating of the catalyst reactivator (4) and the alkene conversion reactor (3) is finished, transferring the catalyst in the catalyst reactivator (4) to the alkene conversion reactor (3). The catalyst adding manner can be flexibly adjusted according to the catalyst temperature in the reactor and in the reactivator by employing the method provided by the invention.

Description

technical field [0001] The invention relates to a catalyst dosing method for the start-up of an olefin conversion unit. Background technique [0002] With the sustained and rapid economic development, the consumption of chemicals produced with ethylene and propylene as basic raw materials has increased year by year. For example, the supply of ethylene and propylene in China has been in short supply for a long time, and the import volume of chemicals produced with ethylene and propylene remains high. Almost all ethylene and propylene in the world are produced using light hydrocarbons, condensate oil, and naphtha as raw materials. Since China's dependence on foreign oil has exceeded 50%, it is of great significance to use non-petroleum routes to produce methanol, and then convert methanol to light olefins such as ethylene and propylene through catalytic conversion. [0003] In today's petrochemical industry, ethylene is almost all obtained through steam cracking of petrochemi...

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Problems solved by technology

[0009] (1) Due to the special requirements of the catalyst in the olefin conversion unit, the temperature rise of the regenerator catalyst cannot be carried out by injecting combustion oil when the operation is started. This is different from the general catalytic cracking unit, so it is difficult to store the heat of the catalyst added to the regenerator

[0010] (2) Since the reactor of the olefin conversion unit (such as methanol to olefin unit) is relatively large, the diameter of the dense phase is as high as 11m or more, it is difficult to establish a bed, and it takes a long time to fill the agent, and the regenerator is small, so relying solely on It is inappropriate to transfer catalyst to the reactor after heat storage of the regenerator catalyst

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